The event stays neutral. You bring the meaning to it. What that means is that the event doesn't care if you are happy, sad, angry, upset, content, or dissatisfied. It is what it is, an event. Whatever else that is brought to it, like the meaning and emotion, is what you brought to it. Take for example three people getting cut off in traffic by the same driver. Driver one is furious that such an idiot was given a license and lets him know it by shouting back and giving a few hand gestures. Driver two experiences the same thing and is upset because it almost caused an accident. He says to himself that that driver was rude and a danger to others. Driver three says to herself, "He must be in hurry to get somewhere." and shrugs it off that that is how some people are. They don't care about anyone else but themselves, same event but different reactions.
What makes one person upset while another person just shrugs it off. Mmm. It is what you make of it. The event only becomes an emotional outburst if you let it become one. NO ONE causes YOU to become angry or upset but yourself. If you do get upset, it is usually something else within you that is causing it to become something more than it is. When you do find yourself in a situation that is upsetting for you, check in with yourself, and ask yourself what is really going on here. Take out what you're feeling at the moment and form an objective view. Ask yourself, "What is the event here” because everything else after that is what you brought to it.